PTCB also regularly shares stories submitted by CPhTs. You can read stories and submit your own: https://www.ptcb.org/cphtstrong16
If you're looking for the number of CPhTs in total or in a particular state, that information is released once a year.
North Dakota had 800 CPhTs as of 12/31/20: https://www.ptcb.org/resources/state-regulations-and-map18
54 Advanced CPhTs as of 12/31/20: https://www.ptcb.org/history/credentials-by-the-numbers17